Evidence

I attempted multiple web searches to find independent reporting or fact-checks on the claim that Russian authorities spent months planning to assassinate Garry Kasparov and Ilya Ponomaryov in the United States, attributed to the Spanish newspaper El Mundo. However, the search tool became unavailable (returning 'server tool use limit exceeded' on every attempt) after the first attempts, so I was unable to retrieve any search results, articles, or fact-checks addressing this specific claim. I found no cached knowledge of this exact story being covered by Reuters Fact Check, AFP Fact Check, Bellingcat, or EUvsDisinfo, nor any corroborating or contradicting reporting from other outlets. I cannot confirm whether El Mundo in fact published this story, nor independently verify any of its details (the months-long planning, the specific targeting of both Kasparov and Ponomaryov together, or the US location).